Implement the "publish-action" action

package.json

@@ -0,0 +1,38 @@
+{
+  "name": "publish-action",
+  "version": "1.0.0",
+  "description": "Update the major version tag (v1, v2, etc.) to point to the specified tag",
+  "main": "lib/main.js",
+  "scripts": {
+    "build": "tsc && ncc build",
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/actions/publish-action.git"
+  },
+  "keywords": [
+    "actions",
+    "publish"
+  ],
+  "author": "GitHub",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/actions/publish-action/issues"
+  },
+  "homepage": "https://github.com/actions/publish-action#readme",
+  "dependencies": {
+    "@actions/core": "^1.2.7",
+    "@actions/github": "^4.0.0"
+  },
+  "devDependencies": {
+    "@types/jest": "^26.0.23",
+    "@types/semver": "^7.3.6",
+    "@vercel/ncc": "^0.28.5",
+    "jest": "^26.6.3",
+    "jest-circus": "^26.6.3",
+    "semver": "^7.3.5",
+    "ts-jest": "^26.5.6",
+    "typescript": "^4.2.4"
+  }
+}